Saw blade planishing machine



March 23; 1948. P. SENARD 2,438,460

SAW BLADE PLANISHING MACHINE Filed Aug. 16, 1946 e SheetsSheet 1 "Wm TOR PIERRE 5 EN: RD

ATTORNEY March 23, 1948. P. SENARD 2,438,460

SAW BLADE PLANISHING MACHINE Filed Aug. 16, 1946 e Sheets-Sheet 2 INVENTOI? P7519 95 .S'N/Mb y MM ATTORNEY March 23, 1948. P. SENARD SAW BLADE PLANISHING MACHINE Filed Au 16, 1946 "6 Sheets-Sheet 3 HTTORNE March 23, 1948.

P. SENARD SAW BLADE PLANISHING MACHINE Filed Aug. 16, .1946

6 Sheets-Sheet 4 IN VENTOR /e/ms fiflv/mo ATTiQNEY March 23, 1948. P. SENARD 2,438,460

SAW BLADE PLANISHING MACHINE Filed Aug. 16, 1946 6 Sheets-Sheet 5 'llllfllflllllllmlllllllllllllllllll U :3 C) //v VEN TOR IERAE SEN W March 23, 1948. P. SENARD SAW BLADE PLANISHING MACHINE F iled Aug. 16, 1946 6 Sheets-Sheet 6 N VE N 7 OR P/ERRE JEN/4 RD ATTORMSY Patented Mar. 23, 1948 SAW BLADE PLANISHING MACHINE Pierre Senard, Bapeaume-les-Rouen, France Application August 16, 1946, Serial No. 691,106 In France May 15, 1945 7 Claims. 1

The machine providing the subject-matter of this invention is designed for the planishing of band saw blades, that is for the removal of such swellings as are caused in operation by sawdust clots or wood splinters getting wedged between the blade and the rim of the pulleys by which the blade is driven.

The said machine is intended to make the planishing operation a completely mechanical and automatic one. With that end in view the blade to b planished is passed between the even surface of a block and a series of compressed air operated hammers each of which is provided with its own actuating means; the distribution of the compressed air to the hammer-actuating cylinders is controlled by electromagnets to be en-- ergized whenever a swelling in the blade becomes positioned in front of a feeler assigned to the corresponding hammer, so that a hammer located in front of any definite point of the blade will be actuated or will remain inoperative depending on whether a swelling is detected or not at the said point by the feeler.

The number of hammers and related feelers may vary according to the width of the blades to be planished; owing to the impossibility of arranging them ln one single row at right angles to the direction of the blade, they may be arranged in one single or several oblique rows with respect to the said direction.

An embodiment of a machine of the kind thus outlined in which the hammers and the feelers are all aligned in one vertical plane above a horizontal block is shown by way of example in the appended drawing.

Figure l is a front elevational view.

Figure 2 is an elevational view looking from the right side, parts being shown in section taken on the axis of a hammer.

Figure 3 is an elevational view looking from the left side, the blade-travelling means being removed.

Figure 4 is a vertical sectional view taken on the axis of a hammer, the related feeler being displaced sidewise into coincidence with the axis of the said hammer.

Figure 5 is a plan view of the carriage, the hammers and the mounting of the same being removed.

Figure 6 is a horizontal'sectional view taken on line VIVI in Fig. l.

Figure '7 is an enlarged view illustrating the actuation of a switch by the related feeler.

Figure 8 is a fractional sectional view taken on line VIII-VIII in Fig. 5 showing the mecha- 2 nism controlling the transversal displacement of the carriage.

Figure 9 is a fractional back elevational view illustrating a mechanism for adjusting the displacements of the carriage.

Figure 10 is side view corresponding to Fig. 9.

Figures 11 and 12 are elevational views of the saw blade travelling mechanism.

Figure 13 is a wiring diagram.

In the drawing, l designates the block on whose top face the saw blade 2 finds a bearing; said blade is travelled intermittently by rubber-lined rolls 3 and 4 between which same is pressed after it has passed below the set of hammers 5.

The shafts 6 of the latter are guided vertically in a frame 1 and each of them is formed at the top end thereof with a piston 8 slidably received in a cylinder 9-bored in the upper part of the frame 1. Each hammer is urged upwards by a spring l0 and is only driven downwards when a sufficient air pressure is exerted upon piston 8.

Said pressure air, which is delivered through a pipe H, is admitted into each cylinder 9 by a valve 12 actuated by an electromagnet l3. As long as the latter is not energized the valve 12 remains in its lower position in which the cylinder communicates with the atmosphere through a vent [2a, so that the hammer is held in its lifted position by spring l0. Upon a suitable current being sent through the electromagnet IS the valve is shifted to its upper position, whereby compressed air will flow into the cylinder and drive the piston 8 downwards, so that the hammer is struck upon the saw blade.

In order that each hammer shall become operative only when a swelling in the blade happens t be positioned therebelow, the machine comprises a series of feelers arranged in a support or carriage l4 mounted for sliding motion between guide bars I 5 rigid with the frame 1. Each feeler is constituted by a needle l6 freely slidable in a vertical guideway drilled in carriage 14; secured on said needle I6 are stops l1 and Ila of which the former normally rests on a support !9 guided for vertical reciprocatory motion in carriage Hi; the said reciprocatory motion is obtained by means of a shaft 20 formed with teeth that mesh with racks 2| rigid with the support M3 to which a rocking movement is imparted by a continuously rotating cam 22 that acts upon a finger 23 rigid with said shaft 20.

The vertical travel of the support 19 is so adjusted that when the latter is in its uppermost position the needles are lifted by an amount sufficient to allow the swellings in the blade 2 to pass freely below the needle points, whereas in the lowermost position of support IS the needles can rest freely upon the even portions of the blade (Fig. 13), or even upon the block if no blade is present.

On the other hand, the stop Ha secured on the lower end of .each needle is adapted to rock .a switchlever 3 designed to make break the circuit for an eleotromagnet acting as a relay; the latter controls the energizing of electromagnet l3 corresponding with the hammer associated contact whenever the corresponding needle encounters a swelling of greater or less height X-position III in Fig, 13). "Said support 26 is adjusted vertically by means of a shaft 2! provided with teeth that mesh with racks 28-rigi-d -with support 26 and actuated when necessary by means 'of a hand wheel 29 and a worm gear coupling 31].

V In the embodiment illustrated the aligned hammers are uniformly spaced 'as well as the needles 'orfeelers 163 37. say, 46 mm. from one 7 axis to the nextcne; Provided in carriage 1% are a series of apertures 3! (Fig. 2) spaced by the same amount and through which the hammers can freely project when said apertures are positioned below the latter, that is, whenever the carriage reaches the end of its stroke forwards (indicated by arrow A). The stroke is about '23 mm, so that at the end of the return stroke (Fig. 4) the needlelfi which formerly were positioned plumb below the intervals between the hammers will now be positioned'exactly below'the latter.

The carriage is'recinrocated by a cam 82 keyed on a shaft 33 and adaoted to act alternatinly upon either of a pair of stops 34, 35rigid withthe carriage. .Said shaft 33 which also carries fthe aforesaid cam 22 is rotated by a motor (not shown).

The reciprocatory motion of the carriage I4 is used to rotate the rolls 3 and 4 intermittently in order to advance the blade 2 by about 5 'to 20 'mm. at every back stroke of the carriage. For

that purpose said rolls are coupled together by 'teeth 36, 3! and one of them is provided with 'ratchetjteeth 33 co-operating with a pawl 39 pivoted on a lever 40 whose one end is'depressed against the action of a springmot shown) by a stop M rigid with the carriage; at every back stroke of t e latter (indicated by the arrow B) the awl 39 will ,thus be swung backwards, which results in the ro ls being rotated by the desired amount; '42 designates a screw serving to adjust the amplitude of movement of lever '40 and conseouently the blade feed. The blade is pressed between rolls 3 and 4 by a counterweight attached toga cable43 run over a p y 44 d s ed a its other end to a slide 45 in which the axle of roller 4 is mounted,

Some additional constructive arrangements will of the macan be guided-on block 1. Guide members '46 and 4 4! are mounted for that purpose at either side of the block, the former being fixed whilst the latter can be moved towards or away from the same as desired; said adjustable guide members 41 are secured on a bar 48 supported adjacent to the ends thereof in a pair" of slides 49 movable at right angles to the longitudinal direction of block 1 and formed with racks 50 .co-operating with a 7 pair of pinions 5I keyed on ashaft 52.; the latter canbe rotated as desired by means of a handwheel 53 through the medium of a worm gear connection.

in fact, the-guiding meansjust described can be modified without departing from the invention, for instance where the block l, instead of retaining an invariable angular position with respect'to'the row of hammers and feelers, would have to be variously set about pivot I00 (Fig. l) or some other way in order that the whole row of hammers may be caused to act upon saws of various'widths; I

Such "setting of the block may be obtained, 9. g, by means of "a :nut m1 guided in a slot 102 in the frame and .moved by the revolution or a screw 103 mounted ran the said frame" and rigid with 'an operating hand-wheel 184. The movable end of the block is connected with said nut'lbl in such manner-that same will partake fof'the movements of theilatter.

Moreover, as zshownjthe machine is so'arranged that. the frame 1 can be displaced slightlyitogether with itscarriage M in adirection at right angles to that of the b1a de=2 with respect to the fixed block-and alternatingly in oneand the other direction after each operation of the hammers, whereby fewer hammers can be used and the machine is reduced in length- 1 For that purpose the frame '7 is mounted for a sliding motion by guides '55 on a fixed frame 5'6 and is reciprocat'e'd bya 'few millimeters with the aid of cams 51 secured on a shaftiis mounted on said fixed 'frame and "coupled with shaft 33 by a set of spur wheels 59, :60 and a set of bevel wheels 61,152 so that its'speed will be reduced by one half with respect'to that of shaft 33;" Carriage I [is thus reciprocated twice longitudinally 7 wheneverit is reciprocated once transversely. As

a consequence, the hammers will "impinge the 7 blade successively on :oblique paralle'lylines; the

transversal stroke controlled by the cams "51 is so adjusted that the said oblique lines will be spaced equally by, say, 5 mm., which spacing after all can be varied according .to the width ofgthe blade.

The said adjustment is 'obtainedby a slight 7 displacement of stops 105 or 105a that are'acted on by the cams =51, which displacement is obtained for instance by means of wedges "I06 'interposed between the stops I andthe carriage M and moved longitudinally with-the aid'of racks Ill! (Figs. 7. 9 and 10) and 'a driving-pinion I08. This will allow accurately to adjustthe trans versal stroke of the carriage whenever a change made in the set of the'block withrespect to the frame.

As a rule, the hammer heads have acircular outline; however, itmay bedesirable' to use ham-- mers with rectangular "heads as shown in the drawing. In that case the hammer heads may advantageously be set in the'longitudinal direction of the blade, or at right angles or obliquely thereto. For that purpose the machine shown comprises a rack "63 sli'dably mounted on the frame 1 and co-operating-with pinions-es rigid ions being such-that the latter will always remain in meshing engagement with rack 63 inspite of the vertical displacements of the hammers; said rack can be displaced as desired by means of a hand-wheel 65 adapted to act upon the same through the medium of a pinion B6 and a small rack 61. g

The electrical equipment of the machine (Fig. 13), in addition to the contact members I8, 25 and the electromagnets l3 controlling the valves 12, comprises electr-omagnets 24 adapted to actuate switching members 69 that will come into contact alternatingly with studs Ill, H; switches 12 controlled by the hammers l4 in their vertical reciprocatory motion and a pair of main switches 73 and I4 actuated by the carriage in the longitudinal displacements of the same. The wirin being as illustrated in Fig. 13, the machine operates as follows:

As the carriage l4 completes its motion towards the right (position X) the main switch 13 is closed whereas 74 is open; at that moment the needles are completely lifted, and so are the hammers, switches l8 and 12 thus being open (position I, Fig. 133; on the other hand, the switch levers 69 are all dropped on studs H with the result that no current can flow through relays 24 or electro-magnets l3.

Stops 19 are moved downwards by the action of shaft 20, which allows the needles IE to fall freely.

Those needles which are not held up in their descending motion by swellings in the blade (position II, Fig. 13) will swing their respective switch arms 25 into contact with studs 25, whereby the corresponding circuits I5, 25, I8, 24, l3, 16 are closed; the said relays 24 will thus remain energized when subsequently the needles H; are lifted by stops l9.

Conversely, w ere needles l6 encounter swellings (position III in Fig. 13), the related switch arms l8 will remain out of contact with studs 25, whereby the related relays 24, whose circuits are switched out at 25, 10 and 12 will leave the related switch levers B9 in their lowered positions.

By the revolution of cam 32 the carriage is then moved forwards (as shown by arrow A) as said carriage completes its stroke (position Y in Fig. 13) it will close the common switch 14; meanwhile, switch 13 has remained in its closed position. The closing of switch 14 will not cause any current to flow through those electromagnets l3 which correspond to needles l6 that did not happen to encounter a swelling, since the related relays 24 remained energized and the corresponding switch arms 69 now are in their lifted positions. However, a current will flow at that moment through all those electromagnets 13 which are connected with studs H with which switch levers 69 remained in engagement, that is, through those which correspond to places on the saw blade where swellings have been encountered by needles l5.

Due to the energizing of said electromagnets, compressed air is admitted into the related cylinders, whereby the corresponding hammers 5 are struck upon the swellings therebelow.

t a definite point in their downward stroke the said hammers will close the switches I2, whereby the related relays 24 are energized through l5, T2, 24, "3 and I5, so that the circuit for electromagnets I3 is broken at H, The hammers which are returned immediately to their lifted position by the action of springs III will not be thrust once more upon the same swellings although switches 12 are open again due to the fact that the circuit through-the relays is closed through'lS, 68, 69,10, 24, 13,16.

By'the action of cam 32 the carriage is displaced once more to the right; in the early stage of its stroke it will break the circuit through electromagnets 14, Whereafter, as a lug TI moves past an arm 18 for the actuation of lever I9 of switch 13, it will cut the flow of current through all the heretofore energized relays 24, so that as the carriage completes its travel (position Y) all the members are again in their initial positions, except the saw blade which has been moved forwards by a few millimeters due to the operation of members 3, 4 and 36 -4 I.

Where, in disagreement'with the arrangement illustrated, the feelers are located beyond the saw blade with respect to the hammers, they will be guided in holes drilled in the block, in which event light springs should urge them permanently into engagement with either the even or the depressed portions of the blade; the relays by which air is fed to the hammers may then be energized by means similar to those already described. Such an arrangement makes it unnecessary to provide for a reciprocatable carriage between the blade and the lifted hammers, whereby the machine is simplified both in construction and operation; on the other hand, contacts are not ensured so reliably unless suitable means are provided to keep the blade in permanent engagement with the block in spite of the pressure exerted by the feelers.

It is to be remarked that the block can be arranged vertically or obliquely instead of horizontally, provided the hammers and feelers are guided at right angles thereto.

Of course, the various arrangement illustrated for the actuation of the movable members of the machine can be replaced by some other mechanical or electrical means capable of operating in the same way without altering the essential features of the invention.

I claim:

1. A saw-blade planishing machine comprising a block for supporting the saw blade, means to move the blade forwards thereon intermittently in the longitudinal direction of the same, a set of feelers to be applied upon the blade, a set of compressed air hammers to be struck upon the blade at the points of the same which are engaged by the feelers and a set of electric control means to be energized or not depending on whether the related feelers are in engagement with swelled out or even portions of the blade, whereby pressure air is fed or not to the said compressed air hammers.

2. A saw-blade planishing machine as claimed in claim 1 wherein the feelers are arranged on the same side as the hammers with respect to the saw blade and can be displaced transversally, in combination with means to bring said feelers alternatlngly into and out of alignment with said hammers, said means as well as the hammer driving means becoming operative during the periods in which the blade remains stationary on the block.

3. A saw-blade planishing machine as claimed in claim 1 comprising means to move the hammers and feelers as a whole crosswiseto the direction of the blade after each impingement between consecutive longitudinal displacements of the blade, for the purpose of multiplying the number of points felt and struck on the blade with respect to the numbed. of hammers and e -1 H 't e 4, A saw-blade: plarlishirig machine as claimed in claim 1 wherein the hloek cemprises means to guide theblade in. a direction parallel therewith and can itselt {removed as desired laterally te allow the blade being set and advanced obliquely to a greater or less degree with respect to the sets oi ffeelers andhammers. v I

5.;A saw-blade plamshing machine as claimed in claim 1 wherein the. hammers have elongated heads and ean be set angularlyas desired with respect to the dlretio oi the blade.

6. A saw-blade planl shlng' machine as claimed in claim; eernprismg a switch in the circuit cor trolling the distribution of compressed air to each hammer, said switch being arranged to be opened by the at ari adjustable point of its stroke for the purpose-oi adjusting the force with which the hammer is st iwls m en the blade;

7.. A. saw-blade planlshing maehine asv claimed in claim 1 wherein vfeelers are arrang opposite the hammers with respect to the blade in guide.- ways provided in the block and are yieldingly held in permanent engagement with the blade. 7

PIERRE SENARD.

Date 

